US4156711A - Process for the removal of impurities contained in a zinc and cadmium sulfate solution - Google Patents
Process for the removal of impurities contained in a zinc and cadmium sulfate solution Download PDFInfo
- Publication number
- US4156711A US4156711A US05/850,520 US85052077A US4156711A US 4156711 A US4156711 A US 4156711A US 85052077 A US85052077 A US 85052077A US 4156711 A US4156711 A US 4156711A
- Authority
- US
- United States
- Prior art keywords
- solution
- sub
- zinc
- acid
- hours
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000011701 zinc Substances 0.000 title claims abstract description 13
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 11
- QCUOBSQYDGUHHT-UHFFFAOYSA-L cadmium sulfate Chemical compound [Cd+2].[O-]S([O-])(=O)=O QCUOBSQYDGUHHT-UHFFFAOYSA-L 0.000 title abstract description 5
- 239000012535 impurity Substances 0.000 title description 4
- 229910000331 cadmium sulfate Inorganic materials 0.000 title 1
- 229910000368 zinc sulfate Inorganic materials 0.000 title 1
- 229960001763 zinc sulfate Drugs 0.000 title 1
- 239000000460 chlorine Substances 0.000 claims abstract description 23
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 15
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 10
- -1 alkali metal salt Chemical class 0.000 claims abstract description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims abstract description 5
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 6
- 229910052793 cadmium Inorganic materials 0.000 claims description 6
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims description 6
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 3
- 229910021653 sulphate ion Inorganic materials 0.000 claims description 3
- 235000011149 sulphuric acid Nutrition 0.000 claims description 3
- 239000001117 sulphuric acid Substances 0.000 claims description 3
- 230000003301 hydrolyzing effect Effects 0.000 claims description 2
- WAEMQWOKJMHJLA-UHFFFAOYSA-N Manganese(2+) Chemical class [Mn+2] WAEMQWOKJMHJLA-UHFFFAOYSA-N 0.000 claims 1
- 150000001447 alkali salts Chemical class 0.000 claims 1
- YZTQKMVBEGUONQ-UHFFFAOYSA-N manganese(4+) Chemical class [Mn+4] YZTQKMVBEGUONQ-UHFFFAOYSA-N 0.000 claims 1
- 239000002253 acid Substances 0.000 abstract description 24
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052783 alkali metal Inorganic materials 0.000 abstract description 4
- 230000002378 acidificating effect Effects 0.000 abstract 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 8
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 7
- 238000005868 electrolysis reaction Methods 0.000 description 5
- 230000007062 hydrolysis Effects 0.000 description 5
- 238000006460 hydrolysis reaction Methods 0.000 description 5
- 229910052748 manganese Inorganic materials 0.000 description 4
- 239000011572 manganese Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 229910003556 H2 SO4 Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 230000035484 reaction time Effects 0.000 description 3
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 3
- 235000009529 zinc sulphate Nutrition 0.000 description 3
- 239000011686 zinc sulphate Substances 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- GGCZERPQGJTIQP-UHFFFAOYSA-N sodium;9,10-dioxoanthracene-2-sulfonic acid Chemical compound [Na+].C1=CC=C2C(=O)C3=CC(S(=O)(=O)O)=CC=C3C(=O)C2=C1 GGCZERPQGJTIQP-UHFFFAOYSA-N 0.000 description 2
- 229910052716 thallium Inorganic materials 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical class [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910021607 Silver chloride Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- FHHJDRFHHWUPDG-UHFFFAOYSA-N peroxysulfuric acid Chemical group OOS(O)(=O)=O FHHJDRFHHWUPDG-UHFFFAOYSA-N 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/01—Chlorine; Hydrogen chloride
- C01B7/03—Preparation from chlorides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G11/00—Compounds of cadmium
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G9/00—Compounds of zinc
- C01G9/06—Sulfates
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S204/00—Chemistry: electrical and wave energy
- Y10S204/13—Purification and treatment of electroplating baths and plating wastes
Definitions
- the present invention concerns a process for removing chlorine ions from a zinc sulphate solution or from a cadmium sulphate solution which may contain other impurities, and more particularly a process for removing chlorine, from sulphate solutions for the production of electrolytic zinc or electrolytic cadmium.
- This method which enables to remove also the various elements Mn, Co, Ni and Tl beside the Cl, has however the drawback that it introduces K ions into the solution; further, the method offers no selectivity at all, all elements being removed at the same time; this is inconvenient especially when one wishes to keep some manganese in the solution in order to protect the lead anodes by means of a MnO 2 precipitate during the electrolysis.
- the present invention which aims to remove the abovestated drawbacks of the known processes, concerns a process for removing chlorine ions from a sulphate solution of zinc or cadmium which has an acidity of at least 10 g sulphuric acid per liter and which may contain other impurities such as Mn, Tl, Co and Ni, which process comprises adding to said solution the so called acid of Caro or an ammonium or alkali metal salt thereof, whereby the chlorine ions are removed selectively.
- the acid of Caro that is peroxymonosulphuric acid or H 2 SO 5 is rather unstable.
- Various processes are known to prepare said acid of Caro or its ammonium or alkali metal salts.
- the acid of Caro may be obtained by simple hydrolysis of persulphuric acid (H 2 S 2 O 8 ).
- persulphuric acid H 2 S 2 O 8 is obtained by anodic oxidation of sulphuric acid on platinum anodes using a high current density. This persulphuric acid hydrolyses progressively according to the following reactions:
- Another method for producing the acid of Caro consists in reacting oleum with hydrogen peroxide at lower temperature; thus, when mixing hydrogen peroxide having a H 2 O 2 content of 70% with oleum containing 25 weight percent of SO 3 , in a molar ratio of total SO 3 :H 2 O 2 comprised between 1.8 and 2, one obtains a final product having the following composition by weight:
- the produced chlorine is gaseous and may easily be removed by blowing air through the solution.
- a solution which is free of manganese (IV) salts As an exhausted acid solution of zinc or cadmium leaving an electrolysis cell always contains manganese IV salts, according to another feature of the invention there is added to said solution a conventional art reducing agent, such as an iron (II) salt, preferable iron (II) sulphate, in an amount which is sufficient to discolour the solution; this amount is usually comprised between 100 and 200 mg/l.
- a conventional art reducing agent such as an iron (II) salt, preferable iron (II) sulphate
- the chloride content of the treated solution varied with the reaction time as it appears from the following table: the starting solution contained 495 mg chloride per liter;
- the starting solution contained 495 mg/l chlorine
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Electrolytic Production Of Metals (AREA)
Abstract
Process for removing chlorine from an acidic zinc or cadmium sulphate solon, comprising adding thereto acid of Caro or an ammonium or alkali metal salt thereof.
Description
This application is a continuation-in-part of U.S. application Ser. No. 693,620, filed June 7, 1976, by Bodson and entitled Process for the Removal of Impurities Contained in a Zinc and Cadmium Solution. This application has matured into U.S. Pat. No. 4,096,233 on June 20, 1978.
The present invention concerns a process for removing chlorine ions from a zinc sulphate solution or from a cadmium sulphate solution which may contain other impurities, and more particularly a process for removing chlorine, from sulphate solutions for the production of electrolytic zinc or electrolytic cadmium.
At present it is known to remove chlorine by adding a silver salt to the solution; thus a precipitate of silver chloride is obtained which is separated by filtration. This way of proceeding is little economical due to the cost of the silver salt, a part of which is lost during the operations.
This is also known a method which provides adding potassium permanganate to the zinc or cadmium sulphate solution. This method, which enables to remove also the various elements Mn, Co, Ni and Tl beside the Cl, has however the drawback that it introduces K ions into the solution; further, the method offers no selectivity at all, all elements being removed at the same time; this is inconvenient especially when one wishes to keep some manganese in the solution in order to protect the lead anodes by means of a MnO2 precipitate during the electrolysis.
The present invention, which aims to remove the abovestated drawbacks of the known processes, concerns a process for removing chlorine ions from a sulphate solution of zinc or cadmium which has an acidity of at least 10 g sulphuric acid per liter and which may contain other impurities such as Mn, Tl, Co and Ni, which process comprises adding to said solution the so called acid of Caro or an ammonium or alkali metal salt thereof, whereby the chlorine ions are removed selectively.
The acid of Caro, that is peroxymonosulphuric acid or H2 SO5 is rather unstable. Various processes are known to prepare said acid of Caro or its ammonium or alkali metal salts.
Thus the acid of Caro may be obtained by simple hydrolysis of persulphuric acid (H2 S2 O8).
It is known that persulphuric acid H2 S2 O8 is obtained by anodic oxidation of sulphuric acid on platinum anodes using a high current density. This persulphuric acid hydrolyses progressively according to the following reactions:
H.sub.2 S.sub.2 O.sub.8 +H.sub.2 O→ H.sub.2 SO.sub.5 +H.sub.2 SO.sub.4
h.sub.2 so.sub.5 +h.sub.2 o→ h.sub.2 o.sub.2 +h.sub.2 so.sub.4
therefore it is almost impossible to keep pure persulphuric acid and in general one has a mixture of the three components: H2 S2 O8, H2 SO5 and H2 O2.
In a solution of persulphuric acid, the amounts of each of these three components have been determined after various hydrolysis times at a temperature of 22° C. The results of these analyses are represented in the following Table I.
TABLE I
______________________________________
Hydrolysis H.sub.2 S.sub.2 O.sub.8
H.sub.2 SO.sub.5
H.sub.2 O.sub.2
time mole/l mole/l mole/l
______________________________________
0 1.45 0.00 0.00
10 min. 1.27 0.18 0.00
30 min. 1.10 0.35 0.00
1 h 0.96 0.51 0.00
1 h 30 0.81 0.71 0.00
2 h 0.64 0.87 0.010
3 h 0.37 1.07 0.015
5 h 0.15 1.30 0.030
6 h 0.095 1.35 0.040
7 h 0.05 1.37 0.050
10 h 0.015 1.39 0.080
25 h 0.00 1.23 0.20
______________________________________
Another method for producing the acid of Caro consists in reacting oleum with hydrogen peroxide at lower temperature; thus, when mixing hydrogen peroxide having a H2 O2 content of 70% with oleum containing 25 weight percent of SO3, in a molar ratio of total SO3 :H2 O2 comprised between 1.8 and 2, one obtains a final product having the following composition by weight:
H2 so5 :43%; h2 o2 :1%; h2 s2 o8 :1.6%; h2 so4 :44% and H2 O= rest.
It appears that also in this case a mixture of H2 SO5, H2 O2 and H2 S2 O8 is obtained having a maximum H2 SO5 content. When such a mixture of the three components H2 S2 O8, H2 SO5 and H2 O2 is added to a zinc or cadmium sulphate solution containing Cl, this element is oxidized to a removable form.
The following reactions takes place:
ZnCl.sub.2 +H.sub.2 S.sub.2 O.sub.8 →ZnSO.sub.4 +H.sub.2 SO.sub.4 +Cl.sub.2
ZnCl.sub.2 +H.sub.2 SO.sub.5 →ZnSO.sub.4 +H.sub.2 O+Cl.sub.2
The produced chlorine is gaseous and may easily be removed by blowing air through the solution.
It has been found that the chlorine is removed alone or in a selective way, that is to say without other elements, if the reaction is performed in an acid solution, such as for instance a solution issuing from the electrolysis of the zinc or the cadmium; in that case one simply adds the acid of Caro or an ammonium or alkali metal salt thereof to the solution.
In order to favour the removing of the chlorine, there is used according to one feature of the present invention, a solution which is free of manganese (IV) salts. As an exhausted acid solution of zinc or cadmium leaving an electrolysis cell always contains manganese IV salts, according to another feature of the invention there is added to said solution a conventional art reducing agent, such as an iron (II) salt, preferable iron (II) sulphate, in an amount which is sufficient to discolour the solution; this amount is usually comprised between 100 and 200 mg/l.
According to another feature of the invention, there is used acid of Caro which has been obtained by hydrolysing a certain time; tests have shown that a hydrolysis of 10 to 14 hours, at a temperature of 20° C., provides the optimal contents of acid of Caro.
In each of the examples hereafter, when it is mentioned that a stoichiometrical amount of persulphuric acid or acid of Caro solution is used for the oxidation of the element Cl, it is understood that the total amount of the oxidation agents contained in the persulphuric acid or acid of Caro solution, namely H2 S2 O8, H2 SO5 and H2 O2, parttakes to the oxidation reaction of the chlorine ions.
Test 1
To an acid solution of zinc sulphate issuing from an electrolysis cell, and containing:
Zn:50 g/l; H2 SO4 :170 g/l; Cl:495 mg/l,
145 mg/l iron (II) sulphate were added in order to reduce the manganese (IV) salts, which is visible to the discolouring of the solution. To the solution heated to 40° C., the stoichiometric amount of freshly prepared persulphuric acid needed for removing the chloride ions, was added at one time, and the formed chlorine was released by blowing air through the solution.
The chloride content of the treated solution varied with the reaction time as it appears from the following table: the starting solution contained 495 mg chloride per liter;
then, after 1 hour: 300 mg/l
then, after 2 hours: 240 mg/l
then, after 3 hours: 210 mg/l
then, after 4 hours: 175 mg/l
then, after 5 hours: 170 mg/l
After 5 hours, the chlorine was removed to an extent of 66%.
Test 2
Using the same solution as in test 1, H2 S2 O8 was added thereto as in said test 1, however without having previously reduced the manganese (IV) salts.
The chloride contents varied with the reaction time in the following way:
The starting solution contained 495 mg/l chlorine;
then, after 1 hour: 375 mg/l
then, after 2 hours: 372 mg/l
then, after 3 hours: 370 mg/l
then, after 4 hours: 364 mg/l
then, after 5 hours: 362 mg/l
In this case one observes that after 5 hours only 27% of the chlorine was removed.
When comparing these two tests of example 1, one clearly sees that the previous reduction of the manganese (IV) salts favours the removing of the chloride ions.
To an acid zinc sulphate solution, issuing from zinc electrolysis cells, which solution contained:
Zn:52 g/l; H2 SO4 :169 g/l; Cl:700 mg/l
125 mg/l iron (II) sulphate were added in order to reduce the manganese (IV) salts.
To this discoloured solution were added at one time:
in a first test the stoichiometric amount of freshly prepared H2 S2 O8 needed for removing the chlorides;
in a second test, the same amount of H2 S2 O8 which had been hydrolysed during 10 hours;
in a third test, the same amount of H2 S2 O8 which had been hydrolysed during 42 hours at 10° C. The chloride contents were determined after various reaction times of the H2 S2 O8 for each of the three tests. The results are represented in Table 3 below:
TABLE 3
______________________________________
2 3
1 H.sub.2 S.sub.2 O.sub.8
H.sub.2 S.sub.2 O.sub.8
Freshly hydrolysed hydrolysed
prepared during 10 h
during 42 h
Test H.sub.2 S.sub.2 O.sub.8
at 12° C.
at 12° C.
______________________________________
Chloride con-
tents at the
starting 700 mg/l 700 mg/l 700 mg/l
after 1 hour 452 295 400
after 2 hours
400 238 295
after 3 hours
350 212 275
after 4 hours
312 175 252
after 5 hours
270 165 252
Removement of the
Cl after 5 hours
61.43% 76.43% 64%
______________________________________
From these results, it appears that the removement of the chloride ions is at its maximum when the H2 S2 O8 has been submitted to a duration of hydrolysis corresponding to obtaining the maximum content of acid of Caro.
Claims (5)
1. Process for removing chlorine anions from a sulphate solution of zinc or cadmium, having an acidity of at least 10 g sulphuric acid per liter, comprising adding to said solution a solution of H2 SO5 or an ammonium or alkali salt thereof.
2. Process according to claim 1, wherein the solution of H2 SO5 is prepared by hydrolysing a solution of H2 S2 O8 until its H2 SO5 content has reached a maximum.
3. Process according to claim 2, wherein the solution of H2 S2 O8 has been hydrolysed during a time comprised between 10 and 14 hours at a temperature of 20° C.
4. Process according to claim 1, wherein the solution of H2 SO5 is prepared from oleum and hydrogen peroxide.
5. Process according to claim 1, wherein any manganese (IV) salts are reduced to manganese (II) salts by means of iron (II) sulphate, which is added before adding the solution of H2 SO5.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE830450 | 1975-06-19 | ||
| BE830450 | 1975-06-19 | ||
| US05/693,620 US4096233A (en) | 1975-06-19 | 1976-06-07 | Process for the removal of impurities contained in a zinc and cadmium sulfate solution |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US05/693,620 Continuation-In-Part US4096233A (en) | 1975-06-19 | 1976-06-07 | Process for the removal of impurities contained in a zinc and cadmium sulfate solution |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US4156711A true US4156711A (en) | 1979-05-29 |
Family
ID=25657589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US05/850,520 Expired - Lifetime US4156711A (en) | 1975-06-19 | 1977-11-11 | Process for the removal of impurities contained in a zinc and cadmium sulfate solution |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US4156711A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4198377A (en) * | 1977-09-17 | 1980-04-15 | Interox Chemicals Limited | Process for recovering manganese from aqueous acidic sulphate solutions |
| CN104556205A (en) * | 2014-12-31 | 2015-04-29 | 袁福堂 | Technical method for producing feed-grade zinc sulfate in environment-friendly manner by electrolytic zinc slag |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US570624A (en) * | 1896-11-03 | William donald | ||
| US1066245A (en) * | 1912-12-09 | 1913-07-01 | Anson G Betts | Production of zinc sulfate. |
| US1310943A (en) * | 1919-07-22 | Rasiklai datta | ||
| US1444484A (en) * | 1919-09-25 | 1923-02-06 | Little Inc A | Metallurgical process for treatment of zinc compounds |
| GB370965A (en) * | 1929-11-25 | 1932-04-08 | Nichols Copper Co | Improvements in or relating to processes for eliminating chlorine from solutions containing zinc chloride and to improved solutions obtained thereby |
| US1879577A (en) * | 1929-07-12 | 1932-09-27 | Ig Farbenindustrie Ag | Process for precipitating iron from the solutions freed from copper obtained by burning pyrites with chlorine |
| US2145816A (en) * | 1937-04-20 | 1939-01-31 | Hercules Powder Co Ltd | Purification of zinc salt solutions |
| US2746840A (en) * | 1952-07-24 | 1956-05-22 | Dow Chemical Co | Purification of concentrated salt solutions |
| US2977221A (en) * | 1958-11-17 | 1961-03-28 | Little Inc A | Nickel-cobalt separation |
| US3215627A (en) * | 1962-11-26 | 1965-11-02 | Alto Chemical Lab Inc | Pool sterilization |
| US3393046A (en) * | 1966-02-21 | 1968-07-16 | Giganov Georgy Petrovich | Method for purification of zinc sulphate solutions |
| GB1371302A (en) * | 1973-05-11 | 1974-10-23 | Shell Int Research | Removal of chloride from crude zinc sulphate solutions |
| SU496237A1 (en) * | 1974-04-18 | 1975-12-25 | Московский Ордена Ленина И Ордена Трудового Красного Знамени Химикотехнологический Институт Им. Д.И.Менделеева | The method of purification of zinc sulphate solutions from chlorine |
| US4005174A (en) * | 1974-06-17 | 1977-01-25 | Fernand Jacques Joseph Bodson | Process for the elimination of chloride from zinc sulphate solutions |
-
1977
- 1977-11-11 US US05/850,520 patent/US4156711A/en not_active Expired - Lifetime
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US570624A (en) * | 1896-11-03 | William donald | ||
| US1310943A (en) * | 1919-07-22 | Rasiklai datta | ||
| US1066245A (en) * | 1912-12-09 | 1913-07-01 | Anson G Betts | Production of zinc sulfate. |
| US1444484A (en) * | 1919-09-25 | 1923-02-06 | Little Inc A | Metallurgical process for treatment of zinc compounds |
| US1879577A (en) * | 1929-07-12 | 1932-09-27 | Ig Farbenindustrie Ag | Process for precipitating iron from the solutions freed from copper obtained by burning pyrites with chlorine |
| GB370965A (en) * | 1929-11-25 | 1932-04-08 | Nichols Copper Co | Improvements in or relating to processes for eliminating chlorine from solutions containing zinc chloride and to improved solutions obtained thereby |
| US2145816A (en) * | 1937-04-20 | 1939-01-31 | Hercules Powder Co Ltd | Purification of zinc salt solutions |
| US2746840A (en) * | 1952-07-24 | 1956-05-22 | Dow Chemical Co | Purification of concentrated salt solutions |
| US2977221A (en) * | 1958-11-17 | 1961-03-28 | Little Inc A | Nickel-cobalt separation |
| US3215627A (en) * | 1962-11-26 | 1965-11-02 | Alto Chemical Lab Inc | Pool sterilization |
| US3393046A (en) * | 1966-02-21 | 1968-07-16 | Giganov Georgy Petrovich | Method for purification of zinc sulphate solutions |
| GB1371302A (en) * | 1973-05-11 | 1974-10-23 | Shell Int Research | Removal of chloride from crude zinc sulphate solutions |
| SU496237A1 (en) * | 1974-04-18 | 1975-12-25 | Московский Ордена Ленина И Ордена Трудового Красного Знамени Химикотехнологический Институт Им. Д.И.Менделеева | The method of purification of zinc sulphate solutions from chlorine |
| US4005174A (en) * | 1974-06-17 | 1977-01-25 | Fernand Jacques Joseph Bodson | Process for the elimination of chloride from zinc sulphate solutions |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4198377A (en) * | 1977-09-17 | 1980-04-15 | Interox Chemicals Limited | Process for recovering manganese from aqueous acidic sulphate solutions |
| CN104556205A (en) * | 2014-12-31 | 2015-04-29 | 袁福堂 | Technical method for producing feed-grade zinc sulfate in environment-friendly manner by electrolytic zinc slag |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4006217A (en) | Process for making manganese dioxide | |
| EP0473560B1 (en) | Process for the production of chlorine dioxide | |
| US2802722A (en) | Preparation of monopersulfates | |
| US2376935A (en) | Chlorine dioxide manufacture | |
| US4156711A (en) | Process for the removal of impurities contained in a zinc and cadmium sulfate solution | |
| US4096233A (en) | Process for the removal of impurities contained in a zinc and cadmium sulfate solution | |
| US3760070A (en) | Manufacture of copper oxide | |
| US2332180A (en) | Process of making alkali metal chlorites | |
| US3836442A (en) | Process for recovering mercury from brine solids | |
| US4169134A (en) | Manufacturing chlorine dioxide with thallium and silver or palladium catalysts | |
| US2122735A (en) | Manufacture of manganese dioxide | |
| US5676920A (en) | Chlorine dioxide generating process | |
| US2767055A (en) | Cobaltic pentammine sulfate separation | |
| US2955020A (en) | Method of preparing monopersulfates | |
| EP0465447B1 (en) | Process for the production of chlorine dioxide | |
| US4393029A (en) | Process for the production of an iron-free chronium (III) compound | |
| Price | Per-acids and their salts | |
| US3101248A (en) | Process for the manufacture of alkali metal chlorites and alkaline earth metal chlorites | |
| US3660030A (en) | Method of preparing nitrosyl chloride | |
| US3437439A (en) | Preparation of orthophosphorous acid | |
| JPS5820892B2 (en) | Production method of basic ferric sulfate | |
| US2049358A (en) | Production of cuprous cyanide | |
| US2722510A (en) | Process of preparing alkali metal-titanium fluoride | |
| US2489574A (en) | Process for the production of perchlorates and chlorine dioxide | |
| SU850583A1 (en) | Method of producing ammonium sulfate |